Charge-ordering and spin-dimerization transition in CuIr2 S4

Lattice dynamics confirms octamer correlations

authored by

V. Gnezdilov, A. Glamazda, V. Tsurkan, P. Lemmens

Abstract

In the spinel CuIr2S4 an exotic, orbitally driven metal-insulator (MI) transition is observed at TMI∼230K. However, spectroscopic investigations presently do not agree with respect to the role of related lattice distortions and dynamic effects. Here, we present a detailed study of single-crystalline CuIr2S4 from different batches comparing detailed high- and low-temperature phonon spectra. An analysis using dynamic lattice calculations confirms a low-temperature collectively distorted structure according to previous synchrotron x-ray studies. The related isomorphic Ir3+ and Ir4+ octamers' formation and spin dimerization agree well with the proposed P1¯ symmetry. Thereby, previous discrepancies are resolved.

External Organisation(s)

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
Technische Universität Braunschweig
Kharkov National University
University of Augsburg
Moldova State University

Type

Article

Journal

Physical Review Materials

Volume

8

Publication date

20.09.2024

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Materials Science(all), Physics and Astronomy (miscellaneous)

Electronic version(s)

https://doi.org/10.1103/physrevmaterials.8.095002 (Access: Closed)